These usually come on runflats, this can make the ride harsh… But as its 12 year old suspension, it should feel a little nicer than 10 years ago! If you find the ride harsh, you can ditch the runflats which makes it feel a lot nicer.
On the stero front: Business Audio is complete rubbish (1x Sub, 2x Door Mids, 2x Shelf Mids, rubbish amp). The Professional Headunit is much better. Speaker options, I wouldn’t go for anything less than HiFi, comes with tweeters and an extra sub under the drivers seat. The I-Drive is not worth it (I know, I have it!), its very dated and you can buy an add on screen for any BMW these days for not a lot of money.
I don’t think the economy on the small petrol engines are very good, I swear I read somewhere the 118i has the same economy as the 130i… or it might have been the 116i vs 130i..
Cup Holders, it might not come with any or it might come with one, but you can’t use it unless you flip up the arm rest.. Not exactly deal breaking, but something to look out for.
There are loads of options for these cars: Xenon’s are really good, they make the car look a little better and are like having a sun light the way compared to the candle powered halogen lights.
Make sure the Parking Sensors work and bongs n bings work. Common problem is they stop working as the PDC control unit can get soaked in water due to a rubbish design. Unsure what year they updated this.